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Finding the Fourth Proportional to 125.20, 172.75 and 73.45

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Solution

The fourth proportional to 125.20, 172.75 and 73.45 is: 101.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    125.20 : 172.75 = 73.45 : x
  2. Step 2: Convert to fraction form
    125.20/172.75 = 73.45/x
  3. Step 3: Cross multiply
    125.20x = 172.75 × 73.45
  4. Step 4: Simplify right side
    125.20x = 12,688.49
  5. Step 5: Solve for x
    x = 12,688.49/125.20
  6. Step 6: Final answer
    x = 101.35

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.